Automatic cut-off for weighing-scales.



Patented May 16,1905.

PATENT OEEIcE.

CHRISTIAN SUNDBY, OF DULUTH, MINNESOTA.

AUTOMATIC CUT-OFF FOR WElGHlNG-SCALES.

SPECIFICATION forming part of Letters Patent No. 790,231, dated May 16, 1905.

Application filed January 19, 190i'. Serial No. 241,847.

To fz/ZZ when?, '171; m/f//y/ concern:

Be it known that I, CHRISTIAN SUNDBY, a citizen of the United States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful Improvements in Automatic Out-Oils for lVeighing-Scales; and l do declare the lollowing to be a iull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in cut-ell Inechanisms for weighing-scales.

The object of the invention is to provide a cutoil mechanism 'for scales which will be automatically operated by the weight of the goods discharged onto the scale-pan, whereby when the required amount of goods has been deposited on said pan and the same is tipped a cut-oil mechanism will be released to cut oil the discharge of material onto said scale-pan.

A 'further object is to provide a device of this character which will be simple, strong, and durable in construction, eflicicnt and reliable in operation, means being provided whereby the weight o'l the material in the hopper will be removed Vfrom the cutoil mechanism, thus permitting the same to Jfreely operate when released.

With these and other objects in view the invention consists of certain. novel features of' construction, combination, and arrange.- ment of parts, as will be hereinafter de scribed and claimed.

ln. the accompanying drawing is illustrated a vertical sectional view of the device, showing the application. of the same.

Referring more particularly to the drawing, l denotes a hopper which is adapted to contain the Inaterial or goods to be weighed. The hopper l is provided with a bottom 2, which inclines from the front and rear sides of the same and terminates in a zigzag discharge-spout 3, which forms a tortuous passage through which the material passes before being discharged.. Near the lower or discharge end o'l the spout 3 is arranged a reciprocating cut-oil valve 4, the upper edge of which is pivotally connected to one arm oi a bell-crank lever 5, mounted upon the upper side o'l the spout 3. Near the opposite end oi the bell-crank lever 5 is connected one end of a coil-spring 6, the opposite end ci which is connected to the bottom of the hopper, as shown. Pivetally mounted in a bracket 7 on the inner side o'l the hopper is a detent S, with which the end of the bell-crank lever 5 is adapted to be engaged to hold the valve 4 in an open position. Arranged on the bottom of the hopper adjacent to the detent S is an electromagnet, which when energized will attract the detent S and disengage the same 'from the bell-crank lever 5, thus allowing the spring G to actuate the same and close the valve 4. On the lower side of the discharge-spout beneath the valve 4 is arranged a pad l0, preferably `formed ol' a brush construction, said pad being adapted to receive the lower end of the valve when the same is Yforced or projected to a closed position by the spring 6, this arrangement preventing the valve Afrom `forcibly striking upon the goods being discharged from the hopp er, and thereby breaking or injuring said goods.

Beneath the discharge-spout 3 is arranged a scale l2, upon which the goods is to be laid. The scale l2 may be of any suitable construction of balance-scale and is here shown as consisting of two pans or receptacles 13 and 14, mounted upon a pivoted beam l5, one of said pans being adapted to receive weights, while the other is arranged beneath the spout 3 to receive the goods discharged therefrom. Arranged upon the base ol the scale is one contact-point 16 of an electric circuit, while in uXtaposition therewith and connected to the scale-beam is the other contact-point 17 of the circuit. The opposite ends oi the circuit are connected with the electromagnet l). The electric circuit here-shown consists of a battery-circuit, the battery 1S being arranged with a battery-box 19, 'forming a part oil the hopper-support, and is disposed beneath the hopper.

In operation a weight of the required size is placed upon the wei ght-pan 14, alter which the valve 4 is opened and the bell-crank lever 5 engaged with the detent S to hold the same IOO ' the magnet 9 to be energized, which will then attract the detent 8 and disengage the sarne from the bell-crank lever, thereby permitting the spring 6 to actuate the same and close the valve 4. The zigzag construction of the discharge-spout 3 will tend to hold back 4the weight of the material in the hopper and prevent the same from pressing upon the valve 4 '-to such an extent as to prevent the same from working easily.

:An automatic cut-odevice such as hereinbefore described will be found to be advantageous in weighing all materials which will readily pass through a discharge-spout from ahopper or other receptacle and will be found to-'ibe particularly useful in vthe Weighing of 2 5:

; packages. i

llarge quantities ofgoods to be putl up into From the foregoing description, takenin connection with the accompanying drawings,

theconstruction and operation of the inven- 3o' ltion will lbe readily understood-Without requiring amore extended explanation.

Various changes in the form,y proportion,

i andthe minor details of construction may be resorted -to without departing from y,the principle or sacrificing any of the advantages of this invention.

. Having thus describedmy invention, what I claim as new, and desire to secure by Letters A v Patent, is-

1. In an automatic cut-off for weighingscales, the combination of a weighing-scale, a hopper having a zigzag discharge-spout, a cut-off valve at the discharge end of said spout, abellecrank lever connected to said valve, a pivoted detent Vfor holding said lever in position to retain the valve in open position, electrical means whereby the lever is released from the detent to permit the valve to close when a predetermined weight has been fed to the scales,` and a spring connected to the lever andihopperfory closing the valve, substantially asvzdescribed.

2. In an automatic^cut+off .mechanism :for

\ weighing-scales, the combination of a hopper vhaving azlg-zag spoutewherebyfa tortuous ydischarge-passage 1s formed, a cut-off valve arranged 1n :said spout,a lever and detent rwhereby'said valve is held in an open position,

electrical rneansY whereby the same is automatically released, and aspring whereby the same is closed, substantially asidescribed.

In testimony whereof I have'hereunto Yset my hand in.-presence of two subscribing witnesses.

. CHRISTIAN SUNDBY. Witnesses:

P; GEO. HANsoN, OSCAR HANsoN. 

